update phpcs link

contributing.md

@@ -30,7 +30,7 @@ Before submitting a pull request:
 
 If the project maintainer has any additional requirements, you will find them listed here.
 
-- **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - The easiest way to apply the conventions is to install [PHP Code Sniffer](https://pear.php.net/package/PHP_CodeSniffer).
+- **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - The easiest way to apply the conventions is to install [PHP Code Sniffer](https://github.com/squizlabs/PHP_CodeSniffer).
 
 - **Tlint styles** - Tighten-specific styles. Tlint is built for apps, so there are some settings that might not make sense in a package, but [download Tlint](https://github.com/tightenco/tlint) and run it on your pull requests to see if it suggests any reasonable changes.